1 /*- 2 * Copyright (c) 1994, Garrett Wollman 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 * 25 * $FreeBSD: src/lib/libc/net/getnetbynis.c,v 1.11 1999/08/28 00:00:07 peter Exp $ 26 * $DragonFly: src/lib/libc/net/getnetbynis.c,v 1.4 2005/11/13 02:04:47 swildner Exp $ 27 */ 28 29 #include <sys/param.h> 30 #include <sys/socket.h> 31 #include <netinet/in.h> 32 #include <arpa/inet.h> 33 #include <netdb.h> 34 #include <stdio.h> 35 #include <stdlib.h> 36 #include <ctype.h> 37 #include <errno.h> 38 #include <string.h> 39 #include <arpa/nameser.h> 40 #ifdef YP 41 #include <rpc/rpc.h> 42 #include <rpcsvc/yp_prot.h> 43 #include <rpcsvc/ypclnt.h> 44 #endif 45 46 #define MAXALIASES 35 47 #define MAXADDRS 35 48 49 #ifdef YP 50 static char *host_aliases[MAXALIASES]; 51 #endif /* YP */ 52 53 static struct netent * 54 _getnetbynis(const char *name, char *map, int af) 55 { 56 #ifdef YP 57 char *cp, **q; 58 static char *result; 59 int resultlen; 60 static struct netent h; 61 static char *domain = (char *)NULL; 62 static char ypbuf[YPMAXRECORD + 2]; 63 64 switch(af) { 65 case AF_INET: 66 break; 67 default: 68 case AF_INET6: 69 errno = EAFNOSUPPORT; 70 return NULL; 71 } 72 73 if (domain == (char *)NULL) 74 if (yp_get_default_domain (&domain)) 75 return (NULL); 76 77 if (yp_match(domain, map, name, strlen(name), &result, &resultlen)) 78 return (NULL); 79 80 bcopy((char *)result, (char *)&ypbuf, resultlen); 81 ypbuf[resultlen] = '\0'; 82 free(result); 83 result = (char *)&ypbuf; 84 85 if ((cp = index(result, '\n'))) 86 *cp = '\0'; 87 88 cp = strpbrk(result, " \t"); 89 *cp++ = '\0'; 90 h.n_name = result; 91 92 while (*cp == ' ' || *cp == '\t') 93 cp++; 94 95 h.n_net = inet_network(cp); 96 h.n_addrtype = AF_INET; 97 98 q = h.n_aliases = host_aliases; 99 cp = strpbrk(cp, " \t"); 100 if (cp != NULL) 101 *cp++ = '\0'; 102 while (cp && *cp) { 103 if (*cp == ' ' || *cp == '\t') { 104 cp++; 105 continue; 106 } 107 if (q < &host_aliases[MAXALIASES - 1]) 108 *q++ = cp; 109 cp = strpbrk(cp, " \t"); 110 if (cp != NULL) 111 *cp++ = '\0'; 112 } 113 *q = NULL; 114 return (&h); 115 #else 116 return (NULL); 117 #endif 118 } 119 120 struct netent * 121 _getnetbynisname(const char *name) 122 { 123 return _getnetbynis(name, "networks.byname", AF_INET); 124 } 125 126 struct netent * 127 _getnetbynisaddr(unsigned long addr, int af) 128 { 129 char *str, *cp; 130 unsigned long net2; 131 int nn; 132 unsigned int netbr[4]; 133 char buf[MAXDNAME]; 134 135 if (af != AF_INET) { 136 errno = EAFNOSUPPORT; 137 return (NULL); 138 } 139 140 for (nn = 4, net2 = addr; net2; net2 >>= 8) { 141 netbr[--nn] = net2 & 0xff; 142 } 143 144 switch (nn) { 145 case 3: /* Class A */ 146 sprintf(buf, "%u", netbr[3]); 147 break; 148 case 2: /* Class B */ 149 sprintf(buf, "%u.%u", netbr[2], netbr[3]); 150 break; 151 case 1: /* Class C */ 152 sprintf(buf, "%u.%u.%u", netbr[1], netbr[2], netbr[3]); 153 break; 154 case 0: /* Class D - E */ 155 sprintf(buf, "%u.%u.%u.%u", netbr[0], netbr[1], 156 netbr[2], netbr[3]); 157 break; 158 } 159 160 str = (char *)&buf; 161 cp = str + (strlen(str) - 2); 162 163 while(!strcmp(cp, ".0")) { 164 *cp = '\0'; 165 cp = str + (strlen(str) - 2); 166 } 167 168 return _getnetbynis(str, "networks.byaddr", af); 169 } 170